When was the hourglass popular?
I'm curious about the history of the hourglass. Specifically, I want to know when it gained popularity. Was it during a certain century or perhaps associated with a particular historical event?
When did Google go carbon free?
I want to know the specific time or year when Google achieved carbon neutrality or became carbon free. This information is important to me as I'm interested in the sustainability efforts of large companies like Google.
When was radar first used?
I'm trying to find out the origin of radar technology. Specifically, I want to know when radar was first utilized. Can someone provide me with this information?
When was IHC developed?
IHC, or Immunohistochemistry, is a technique developed and optimized by R&D Systems. It involves the fixation, microtome sectioning, and staining of paraffin-embedded tissue samples. The precise experimental conditions for each antigen of interest are determined by the investigator. This technique has been widely used in pathological diagnosis to identify cell types, recognize cell products, and understand the degree of differentiation, among other applications.
What is the timeline of HFMD in adults?
I want to know the timeline of HFMD in adults, including the progression of symptoms, duration of illness, and any critical stages to be aware of.